Usage

In hint-mode, When press <Space>, enter into asdfghjkl; mode.
(If you want to leave this mode, re-press <Space>)
You can change the keybind for enter into asdfghjkl like below

let g:asdfghjkl_mode_change_key = "<C-c>"

You can also change the keys for inputting numbers like below

let g:asdfghjkl_hintchars = "/zxcvbnm,."

Note that the numbers 0-9 are corresponding to
characters from the left side to the right side of the string.

Link

http://d.hatena.ne.jp/nokturnalmortum/20081021#1224543467